RE: nested tuple slice

[Leeds, Mark]

maybe list(tuple)[0:2])) will

get you what you

want  but I don’t know how to

change it back to a tuple.

I’m just starting out but

I would be interested also.

 

    mark

 

-Original Message-
From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of dimitri pater
Sent: Tuesday, April 12, 2005 5:49
PM
To: python-list@python.org
Subject: nested tuple slice

 

hello!

I want to change a nested tuple like:
tuple = (('goat', 90, 100), ('cat', 80, 80), ('platypus', 60, 800))
into:
tuple = (('goat', 90), ('cat', 80), ('platypus', 60))

in other words, slice the first elements of every index

Any ideas on how to do this in an elegant, pythonic way?

Best regards,
Dimitri









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FW: FW: Python help group

[Leeds, Mark]

This is a follow up question
To the previous question
About sorting that
I sent for my friend.

  



-Original Message-
From: Tan, Heap Ho 
Sent: Tuesday, March 22, 2005 2:06 PM
To: Leeds, Mark
Subject: RE: FW: Python help group

How can you speed it? Does anyone know if pytable can take
non-homogeneous objects type?


-Original Message-
From: Leeds, Mark 
Sent: Tuesday, March 22, 2005 1:39 PM
To: Tan, Heap Ho
Subject: FW: FW: Python help group



-Original Message-
From: Swaroop C H [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, March 22, 2005 1:25 PM
To: Leeds, Mark
Cc: python-list@python.org
Subject: Re: FW: Python help group

On Tue, 22 Mar 2005 13:15:15 -0500, Leeds, Mark wrote:
> I want to do a sort on a list of objects based on a similar attributes
in
> each object for example time of creation of this object. 

>>> 
>>> class Student:
... def __init__(self, name, age):
... self.name = name
... self.age = age
... 
>>> 
>>> students = [Student('John', 18), Student('Jill', 17)]
>>> students.sort(lambda x,y: cmp(x.age, y.age))
>>> [student.name for student in students]
['Jill', 'John']
>>> 

See `help(list.sort)` for details.

-- 
Swaroop C H
Blog: http://www.swaroopch.info
Book: http://www.byteofpython.info
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FW: Python help group

[Leeds, Mark]

Can someone help me with below  ?

It’s not my question but I will

forward any answers to my friend

who I am sending this for.

 


Mark

 

 

 

-Original Message-
From: Tan, Heap Ho 
Sent: Tuesday, March 22, 2005 1:11
PM
To: Leeds, Mark
Subject: Python help group

 

I want to do a sort on a list of objects
based on a similar attributes in each object for example time of creation of
this object.

Is there a simple way to do this?

Thank

 

 

 

-Original Message-
From: Leeds, Mark 
Sent: Monday, March 21, 2005 5:35
PM
To: Tan, Heap Ho
Cc: Leeds, Mark
Subject: crontab

 

 






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newbie:unique problem

[Leeds, Mark]

I have a function uniqueList that is below :

 

Def uniqueList(origList):

 

    nodups= {}

    for temp in origList:

   nodups[temp]  =
None

    returns nodups.keys()

 

When used in the following context :

 

industryList = uniqueList(jpbarradata[group])

 

where jpbarradata[group] might look like

 

[“AAA BC”,BBB KK”,”CCC TD”,”AAA
KP”,”CCC TD”]

 

,the function works in the sense that it would return

 

[“AAA BC”,”BBB KK”,”CCC TD”,AAA
KP”]

 

because CCC TD is duplicated.

 

But, I also want it to get rid of the AAA KP because

there are two AAA’s even though the last two letters

are different. It doesn’t matter to me which one

is gotten rid of but I don’t know how to change

the function to handle this ? I have a feeling

it’s not that hard though ? Thanks.

 

 

 

 

 

 

 

 

 

 

 

 






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newbie : modifying a string in python

[Leeds, Mark]

I want to modify a string in the following way :

 

for s in stks:

  s = s.strip()

  if ( s[-2:] == ‘GR’
):

 
s[-2:]= ‘GF’

 

so, if the last two characters are GR, I want to change

them to GF ( there will be other if statements also but I am

just putting this one here for simplicity ).

 

I think the code is fine but I vaguely remember

reading somewhere in the documentation that

python strings can’t be changed ( only elements of
lists can be ) ?.

Is that true or is it okay to do the above.

.

  
thanks






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using the set command

[Leeds, Mark]

Do I have to import something

In order to use the set command ?

I am trying to use it but

I keep getting an error.

 

 Mark






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novice question

[Leeds, Mark]

I have a dictionary grp that has lists

for each element ( excuse my terminology if it’s

incorrect).

 

So gname might be automobiles, finance, construction etc

and grp[gname] is a list and this list

has elements that are strings

such as [“AAA”,”BBB”,”AAA”,”CCC”]

 

Is there a quick way to loop through

the grp dictionary and reduce the lists

so that each only contains unique elements ?

 


thanks






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FW: list reduction

[Leeds, Mark]

 

I have a structure in python that I think is a list

with elements .Cap
and .Ticker

where Cap
is a float and Ticker
is string.

 

So, I reference things like

industrylist[i].cap and industrylist[i].ticker

and this works fine.

 

What I want to do is reduce the list

so that it only keeps elements of the list

for which the cap is less than x where x is known ?

 

I think I need to use filter and lambda but

i’ve looked in the documentation

and I haven’t been able to figure out

how to use it.

 

Apologies if this is a bad question.

 

   
Thanks

 

 

 






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quick question

[Leeds, Mark]

I have a string variable say “8023 “ and

I want to get rid of the beginning

And ending quotes.

 

I’ve tried different things

But haven’t had any success.

 

I’m definitely a python hacker and

Not an expert. Thanks.

 

 

   Mark






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